I run my Radrover in Sandy conditions sometimes and keeping the PAS in 3, good pedal effort in 1st or 2nd gear, keeping the tires straight, keep my speed up, and a few hits on the throttle can get me through most sandy conditions. Moist beach sand shouldn't be a problem. Extremely loose, hot, dry, and +3 inch deep sand still kicks my butt every time. The 4" fat tires do ride through sand a little better if you lower the PSI in the 10-15 PSI range. I just keep it around 20 PSI because I have mixed terrain from paved roads down to sand on most of my rides.